Scarlett Johansson has reportedly called in the FBI after some revealing photographs were allegedly hacked from her personal mobile phone.

TMZ.com reports that representatives for the 26-year-old actress contacted the Agency after several images appeared on a number of websites in America, although Johansson has yet to comment on this, or confirm that the snaps are genuine. One of the shots depicts a tattoo previously sported by the actress.

Meanwhile, gossip about Friends With Benefits co-stars Mila Kunis and Justin Timberlake has gone into overdrive after images from Kunis' phone also reportedly went astray. These photos are reported to show the pair in a series of cosy shots, including the Sexyback singer wearing a pair of pink undies on his head.

The FBI is refusing to name any people associated with its investigation but, if true, Johansson and Kunis are only the latest in a series of Hollywood stars targeted this year by a group of hackers. Jessica Alba, Christina Aguilera, Miley Cyrus and Vanessa Hudgens have all been named in connection with the investigation.